Multifunction High-Performance Wireless HIFI Over-ear Headphones, Noise Reduction/ Echo Cancellation Headphones, Smart Bluetooth Headsets This Bluetooth headphone supports superior audio transmission mode (A2DP) Ver1.2, audio and video remote control mode (AVRCP) Ver1.0, as well as Bluetooth file transmission agreement OPP. Equipped with noise reduction and echo cancellation technology, this High-Performance Bluetooth Headphone Black enables high-fidelity and rich music besides exceptional video experience. Bluetooth communication range: Line without blocking state, more than 10 meters (mobile phones and other devices of different types and the environment will affect the distance). Music playback time: TF card play eight hours; connect mobile phones to play 6 hours Smart Bluetooth, wireless HIFI